This polyurethane anti-fatigue mat should be used in an all dry, non-abrasive area, and should not be used in wet areas. Clean by sweeping or vacuuming. Specs: Point to point resistance: 1.2 x 10X9 Ohm (typical). Resistance to ground: 1.6 x 10X9 Ohm/sq.; Raw material: Polyurethane - freon free; Thickness: 5/8", 5-year warranty. 2' x 4'.